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If (P(t)=42+6t), (P(3)+P(11)) is equal to twice which (P(k))?

Answer and explanation

Correct answer: P(7)

This is a linear function. Here, \(P(3)=42+6\times3=60\) and \(P(11)=42+6\times11=108\), so \(P(3)+P(11)=168\). Also, \(P(7)=42+6\times7=84\); hence \(2P(7)=2\times84=168\). Therefore, the correct answer is \(P(7)\). \(P(6)\) is a close distractor, but \(2P(6)=156\), not 168. Exam tip: for a linear function, the function value at the midpoint of two inputs equals the average of their function values.

Related tags

Linear FunctionsPolynomialsMidpoint PropertyAlgebraic EvaluationClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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